Stereoscopic photography



March l5 1927.

A J. 3. BULLITT,

STEREOSCOPIC PHOTOGRAPHY Filed Jan. 1e, 192e 2 sheets-sheet 1 "Mrch 15,1927. 1,620,992

J. B. BULLITT STEREOSGOPIC 'PHOTOGRAPHY Filed Jan. 16 192e 2 sheets-sheet 2 a miami.

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Patented Mar. 15, 1927.

UNiTEDN STATES JAMES Bj BULLITT, or NEAR SAN rosieromini"oitinii.l

sTEREoscoPIc Piioroemirnv. Y

iippiieation mea January is, 192e. serial N6. 81,705.

' This invention relates particularly to a device, for securing lstereoroentgenograms of the mastoid processes.

In securing stereoscopic photographic plates of the mastoid processes by the use of the X-ray, it has heretofore been eXtremely difiicult'to secure the perfect'` symmetry desired. Furthermore, many plates have been taken under unfavorable conditions ldue to the position which the patient must assumel It is one. object of` the present invention to provide a device ofk the character indicated in which the photographic plates are accurately and symmetrically .supported uponl opposite sides ofthe `sagittal plane of the patients head. v y

.It is another vobject to` provide a device of the character indicated in which the plates are simultaneously and oppositely adjustable relative vto the said plane.

"ly and yquicklyy made without altering the It is still anotherobject of the invention to provide a device ofthe character indicated in ,which vthe-four exposures required tosecure the desired plates may be accurateadjustment of the patients head. v It is also van object to provide a device of the dcharacter indicatedwherein the desired plates 4inay be secured without applyingypressure t'oV either mastoid process.

Finally, it is an object to provide a dei' vice ofthe character `indicated that is simple inform and construction, accurately and quickly adjusted and applied, and highly ecient in its practical application.

-In the drawing: c Figure 1 is a plan view of the device, yapart being brokenr away.

' Figure 2 is a rear elevation' ofthesaine,

" partbeing broken away.

Figure 3 is an end elevation ofthe device. i 1 Figure 4 is a section Online 4 4 of Figurel.; v Figure 5 is a detail perspective of the tube lholder stop. j A y Figure 6 is aperspective view of the device. j

Figure 7 .is aA horizontalpcross-section through one Vof the plate holdingy frames. Figure 8 is a plan view ofthe block around ywhich thestructureis built. c l

Figure 9' is an edgelviewof the yblock shown-in Figure 8.`

'Referring more parteillerly. te @he drewf a frontpiece 3 ing, I show at 1 a base plate provided with laterallyextendingend portions 2-422, and

mounted thereon as shown.

vMounted on platel, and'inthe angle between the Vsaine and piece 3, is a vblock 4. This block 4 is somewhat shorter thanyth-e base plate l so that when it is centrally mounted thereon a ledge as 5--Er1 is left on eachend of the plate 1v for thek purpose hereinafter yset forth. The inner edge `of block 4 is irregular in shape, sloping from bothends inwardly as at 6*-6a to form acute angles with the adjacent ends of the block,

and thence inoresharply inwardly a dis.- tance asiat 7 7, the edge 7V lyingat right angles to the -vedge 6n and at the base thereof, and fthe f edge 7zi lying at right angles i to the edge Gand at thepbase thereof. The portion of the block between edges Tf-7a, thelcentral portions of edges6'6"-, and the forward edge of the block are'undercu't to E forin aslot 8 closed at its forward endl by front piece 3. At the 'base of each edge 6---6a andy mounted upon the edges 7 7a lis a stop member 'as 949%. This'mernber isgprovided with a verticalflangelO-10l byfjineans of'which itis lmounted on block 4', van outwardly'an'd upwardly tilted fiange 11-11a, and a down'- ywardly extending finger12--12a at one end In using this device -it yis necessary that the tube .will assume afixed Vangular position relativeto the sagittal plane of the head posit-ionedtherein. This positive positioningof the tube is secured by forming the symmetrically arranged edges 6--6a and 7 7a on the inner edgeof block 4, and placing the' stopsv 9 9Ell in the fixed positionsy described, these' .parts cooperating with a movable' tube holder hereinafter described. i Mounted on each en d of block 4 is a metal l ing vabar 14 spaced a distance aboveplate 1 to form a" slot 14a of substantially the same height as slot 8 in block 4.l

At 15l I 'show atop member mounted ony block 4 kand carrying platesv 16 and -17 respectively which in `turn are attached to front piece 3 and bar 14 as shown.1 Member 15- vis spaceda distance from bothr front piece3 and bar 14 indicated at 18an'dA 19, these slots 18 and .19 forming, guidetionedtherein and operated by pinions 22-23 mounted on shaft 24 journaled in bearing plates 25-26 mounted on the front and'rear edges of. the, `topnriember 15 as shown. The shaft 24 is provided with a handle 27, and the racks are ,arranged upon opposite sides ofthe pinions so that by turning the handle 27 the two sets of racks are simultaneously. ymoved equal distances in opposite directions. The housing for 'the rear rack and pinion is completed by the l parts. 28.

vIn the lower edge of each` of the end straps l-la is formed a notch as indicated at`29-29a one side edge of this notch vided with an opening 35 near its lower edge. A slot 3 6 is formed yin the inner side l of the "basemembe'r 37 of this frame, and a catchv '38 is pivotally mounted in the top member. 39 as at k40. Y At' 4l is a` spring member mounted on ythe rear end offrame 83 anjdcarrying a pin 42 which passes through 'frame 33'to rform a stop for the lead screen 43 positioned therein. The lead screen is provided with-an opening 44 to define the area of the photograph.

On racks 21 is mounted a. similar frame structure designated by ysimilar numerals followed bythe letterdi. Y

, lhe sagittal plane of the head 45 placed hetv'veen these frames is indicated at 46, andthe "twoframes are equally spaced there from, the two frames converging toward vtheir forward ends at an anglev of substantialylyltwenty degrees. This angular relation between the V.two frames kremains constant,

0f course, ,during alladjustments of the frames. l.

,TheI tube holder used Consists of a fiat barl .47 'soproportionedf.as to/slide freely in the slot 14El Vwhen moved 'bafckwardly in a horizontal IJ-lane, and in 'the notches :2Q-29e when .properly kali'gi'ied. there-'with and. moved vertically. l l

Qnfbar 47 mounted 'a bloelrz48 having a ytulnll 4 lelement 49 mounted thereon. atl a predetermined angle to I21y Iierizontal plane, in thepresent case three and one-eighthdegreesr This` element '49 is openr vat its for- .'w'ardeijd and-has a s'inall open'in'gl at its "arend an'dfin axialaligninent "therewith, s "a Coolidge tube'l ley-'means 52'is split as at 54 to perm'itplacing or removal of the tube, and is normally held together'by bolts 55. D

' Inusing this-device the patients head 1s positioned face upwards between the two frames 33"-'533a with its sagittal plane at right angles to the plane of base plate l. rllhe head vvis given the desired elevation by means of yone or more plates 56 inserted tl'iereunder and the frames are'moved toward each other to'fembraceithe head vby-opeiating handle 27*7 thereby xin'gfthe head'inthe desired position. t

'Assuming lthat the rightv'masto-id is y'toibe photographed vfirst, a lead screen as 43gprovided with opening 44 is placedint'he right frame and held in positionbycatch-42. This screen is so formed and. lpositioned that' the right nrastoid is visibleth-rough =thc opening 44. The cassette 57l carryingfthe photographic. plate is `now placed yin the frame with Vits lower. edge in slot 7BGNand held snugly against the screen 48 by=1nean`s` of the clip or. Catch twliichis Aturned into the yposition indicatedv at "G0 for that pur# pose. l y

"The first-exposure is' now made --with the vbar 47 of thetube holder resting flat on base l and 'bearing against edge "62" ofbloclr 4 and with its forward end ybea-ring in -tlie opposite direction against finger l2 ontstop 9. To secure the second'ph'otograph ,of` the right mas'toid the iirst cassettei's removed land a second one substituted therefor.

With the bar 47 still engaging the parts GfAl and l2 its outer 'ends'is raised so -thatvth'e said barengages notch`29a in 'strap 13a :and the sliding ybar BO'is then moved forwardly thereunder to actas a support therefor. These parts are all soA proportionedthat the tube 51 moves inra/vertical"plane-fa distance. of` substantially 'twol 'andt onehalf inches, the average spacing between the human eyes. ln this position'the secondfexposure is-Inade, and the cassette is then ire" moved. Inv Figure 2 the parts'are'fshown as positionedl foi-"making the iirst exposure' with the bar 47 lresting onplate 1-23 the centerof the Coolidgev tube 5l and the angular position of the' tube 49 being- `indicated by the short line 58. The position yof the tube for making the second exposure is indicated by nthe short line '59.

n To secure corresponding photographs of they left ina'stoidthe'bar I47 is now lowered.

the second cassette used inphotographzing An exposure is now made,landthentheitube fthe right mastoidplaeed in' position? therein.

upon'` the bar 30 is moved into the position shown in dotted lines to support the bar vin this vraised position and the plate changed and an exposure made upon the irst plate used in photographing the right mastoid.

If the patients head has been v,properly placed in the device it' will now be found that stereoscopic plates have now been secured of both right and left mastoid processes that are perfectly symmetrical land accurate in every detail. y

The slot 8 merely provides a guide for the forward end of Vbar 47 so that when the tube is swung from one side to the other the said forward end will readily move from its seat in one stop 9 or 9u to the other.

It is to be understood, of course, that while I'have herein shown and described but` one embodiment of my invention, changes in n form, construction and method of operation may be made within the scopeof the appended claims. I claim 1. A device of the character. described.

a head placed therebetween, and an .X-ray tube holder `operatively mounted relative vto said 'plate holders. c f

3. A device of the character described comprising a pair of photographic plate holders, means for supporting the samein symmetrical relation to the sagittal plane of a head placed therebetween, and means for Supporting an X-ray tube` in operative relation tovveither` holder on the side of said r sagittal plane remote from theholder in conl junction with which it is to be used.

4. .device of the character described comprising a pair of photographic plate holders, means for supportingthe .saine in at right angles to the planes of said holders.

5. A device4 of the character' described comprising a pair of photographic plate holders, means for supporting the saine in symmetrical relation to the sagittal plane of a head placed therebetween, and an X-ray .tube holder mounted in operative relation to said plate liolders'and vertically adjustablek relative to a plane intersecting said sagittal n Y plane at righty angles. c y 6. A device or' the character described l comprising vappair of .photographic plate holders, 'means for supporting the same in symmetrical relation to the sagittal plane of a head-placed therebetween, and` an X-ray tubeholder operatively mounted relative tosaid plate holders and adjustable in two planes, one plane of adjustment intersecting plane at right angles.

7. A device of .the character described comprising a pair of pliotographic'plate holders, means for supporting the same in symmetrical relation to the sagittal plane of' ahead placed therebetween andv at right angles to al plane intersecting said sagittal plane at right angles," and an lX-.ray tube holder operative-ly mounted relative to said plate holders.

v.ii-iMias B. BULLITT.

7() said sagittal plane atrightangles, and the other plane intersecting said lastmentioned 

